[horde] Test Script and availability on mobiles

[John McIntyre]

Sorry, Gmail decided to send that one for me, without asking my permission
first.  I shall try again.

I changed the appropriate line to

Alias /Autodiscover/Autodiscover.xml /usr/share/horde/rpc.php

.. and restarted apache.  I still get..

XXX.XXX.XXX.XXX- myname at mydomain.com [09/Oct/2013:15:28:35 +0100] "POST
/autodiscover/autodiscover.xml HTTP/1.1" 401 - "-"
"WindowsMail/17.0.1119.0516"

.. in the logs.

(the above attempt was made from a Windows tablet, just as a check on
whether the iPhone was causing the problem)